Use minimal Rust installation in docker images and CI

changelog.d/14141.docker

@@ -0,0 +1 @@
+Use the `minimal` Rust profile when building Synapse.

changelog.d/14141.misc

@@ -0,0 +1 @@
+Use the `minimal` Rust profile when building Synapse.

docker/Dockerfile

@@ -106,7 +106,7 @@ ENV CARGO_HOME=/cargo
 ENV PATH=/cargo/bin:/rust/bin:$PATH
 RUN mkdir /rust /cargo
 
-RUN curl -sSf https://sh.rustup.rs | sh -s -- -y --no-modify-path --default-toolchain stable
+RUN curl -sSf https://sh.rustup.rs | sh -s -- -y --no-modify-path --default-toolchain stable --profile minimal
 
 # To speed up rebuilds, install all of the dependencies before we copy over
 # the whole synapse project, so that this layer in the Docker cache can be

docker/Dockerfile-dhvirtualenv

@@ -92,7 +92,7 @@ ENV CARGO_HOME=/cargo
 ENV PATH=/cargo/bin:/rust/bin:$PATH
 RUN mkdir /rust /cargo
 
-RUN curl -sSf https://sh.rustup.rs | sh -s -- -y --no-modify-path --default-toolchain stable
+RUN curl -sSf https://sh.rustup.rs | sh -s -- -y --no-modify-path --default-toolchain stable --profile minimal
 
 
 COPY --from=builder /dh-virtualenv_1.2.2-1_all.deb /

pyproject.toml

@@ -316,7 +316,7 @@ build-backend = "poetry.core.masonry.api"
 skip = "cp36* *-musllinux_i686"
 
 # We need a rust compiler
-before-all =  "curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain stable -y"
+before-all =  "curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain stable -y --profile minimal"
 environment= { PATH = "$PATH:$HOME/.cargo/bin" }
 
 # For some reason if we don't manually clean the build directory we